Around 8yrs old, maybe 10? Worked fine last time I used it, and have no problem firing it up if you want to come take a look. It ran my whole toy hauler/camper, heat/ac water pumps , lights, fridge/freezer, while running halogen work lights and electric tools/ battery tender for my race car. At home, during Sandy it ran my fridge, stove, well pump, TV/game systems, and at least one light in each of our three bedrooms.